Personally I like the right bottom insert the most. It is made of blue waterproof canvas with pink polka dot pockets. Really pretty. It's not the most lightweight but I wouldn't classify it as heavy as well.
Although the insert has bendable sides, I don't dare to keep it inside the bag for prolonged period as I'm afraid of causing marks.
MaiTai inserts are very luxurious indeed. But I don't fancy the folds inside my B (works ok for my K32 tho, no folding), so now l've moved the insert into my Lindy30. And I like because I want my Lindy to continue to have the fortune cookie look
I've now purchased another Samorga-like felt insert for Birkins (right 2nd from top). As they are softer, I don't expect them to cause any markings. But frankly, I don't really like the overall construction of the insert for the price I paid. lol. Samorga probably makes better, but it's marginally thicker and heavier.
Well, the search for THE perfect insert continues......